It's the perfect plane for a game of cat and mouse because if the Y-8 ever received fire from Japan's F-15s, China could simply maintain it was an unarmed transport model carrying troops, or the Y8-F model that carries only livestock.

In the meantime, the plane can perform all manner of sophisticated tests on the seabed floor, while eavesdropping on Japanese communications. China has been flying these planes consistently lately to surveil the contested island chain that's supposed to hold billions in oil and gas reserves.

So, again, on Thursday Japan spotted aircraft in its Air Defense Identification Zone (above the islands) that it believed to be Chinese J-7 interceptors, along with some J-10 fighters whose combat abilities rival that of Western jets. Japan responded with two F-15s scrambled from Naha, Okinawa — just a couple hundred miles away. There are minor variations from either side about who sent what first, but all agree the aircraft met above the islands.

The Chinese planes scattered soon after, but this marked the first time China and Japan flung military assets at one another over the East China Sea island dispute. A line was crossed and staying behind it in the future will only be more difficult.

GoogleAir base Shuimen, China — disputed island chain — Naha, Japan

The U.S. assistant Secretary of State for East Asian and Pacific Affairs Kurt Campbell announced that he will be traveling to Seoul, and Tokyo. What he decides in Tokyo will filter south to Naha and the Japanese unit confronting the Chinese.

It looks like the islands everyone's talking about are a few dots in the middle of nowhere, but all of this is taking place close to the U.S. Consulate and a contingent of several thousand U.S. Marines whose former commanding general told Time in 2010: "All of my Marines on Okinawa are willing to die if it is necessary for the security of Japan."

Firing tracers, which usually contain phosphorous or some highly flammable material, sends a line of light through the air like a laser. Tracers are usually loaded in about every tenth round to let gunners know where they're shooting, but in this case they would be fired to show Chinese pilots they're being fired upon.

An editorial in China's state-run Global Times called this possibility, "a step closer to war," warning a military clash is "more likely" while its people need to prepare "for the worst." With a U.S. presence so close at hand to where these Japanese decisions are being made, and tactical practices employed, we can hope for at least a bit of immediate tempering.

The Chinese jets are likely flying from air base Shuimen, built east of the islands in Fujian Province, not too much farther from the islands than Naha, Okinawa. So both sides have assets equally within reach of the islands.

Satellite imagery of the base came to light in 2009, and experts believe it was completed late last year.

In addition to aircraft, experts believe Russian made S-300 long-range surface-to-air missiles ring the Defense UpdatesOne of the many variations of the Y-8

airbase, providing some of the best missile protection in the world. The S-300 is comparable to the U.S. made Patriot missile recently sent to Turkey for its first line of missile defense against Syria.

All of this located just 236 miles from the contested islands, which have been in dispute between Japan and China for some time. Han-Yi Shaw writes an interesting history of the dispute, for those interested in more background.

While the U.S. takes no official position on who owns the Islands, it would be expected to honor its U.S.-Japan security treaty signed in 1960.

Though this is a formal agreement that the U.S. will aid Japan if it comes under attack, there are few who believe the U.S. would risk a full-blown war with China over a few uninhabited islands, regardless of how much oil and gas lies beneath them.

But with a U.S. presence so closely intertwined in these events, and a contingent of Marines standing by, it seems that whatever happens could involve American input — one way or another.

Associated PressWhat it's all about — or what's beneath them — the Senkaku Islands